FEAT OSes: add table with EOL dates

OS-Debian.md

@@ -3,6 +3,11 @@
 * [Debian Releases official](https://www.debian.org/releases/)
 * [Wiki Debian releases Production](https://wiki.debian.org/DebianReleases#Production_Releases)
 
+| Debian                    | Release date | EOL   | EOL LTS  |
+|---------------------------|-------------:|------:| --------:|
+| 9 *Stretch*  (oldstable)  | 2017-06      | ~2020 | ~2022    |
+| 10 *Buster*  (stable)     | 2019-07      | ~2022 | unknown  |
+
 ## Resources
 
 * [Debian packages](https://packages.debian.org/)

OS-Ubuntu.md

@@ -3,6 +3,12 @@
 * [Ubuntu lifecycle](https://ubuntu.com/about/release-cycle)
 * [Ubuntu list of releases (past + future)](https://wiki.ubuntu.com/Releases)
 
+| Ubuntu | Release date | End of standard support |
+|--------|-------------:|------------------------:|
+| 16.04  | 2016-04      | 2021-04                 | 
+| 18.04  | 2018-04      | 2023-04                 | 
+| 20.04  | 2020-04      | 2025-04                 |
+
 ## Resources
 
 * [Ubuntu packages](https://packages.ubuntu.com/)